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SPARK PLUG WORKING AND TYPES

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VALUE TIMING DIAGRAM OF A FOUR STROKE, OTTO CYCLE ENGINE

  VALUE TIMING DIAGRAM OF A FOUR STROKE, OTTO CYCLE ENGINE It has already been explained in the operation of four stroke, Otto cycle engine that the inlet valve opens during the suction stroke and the exhaust stroke and the exhaust valve opens during the exhaust stroke. The exact moment at which each of the valves opens and closes with reference to the position of the piston and crank can be show graphically in a diagram. This diagram is known as valve timing diagram. Theoretically, the inlet valve opens exactly at the beginning of suction stroke and closes at the end of the stroke. Both the valves close during power and compression stroke. The exhaust valve opens exactly at the beginning of exhaust stroke and closes at the end of the stroke. The theoretical valve timing diagram for a four stroke Otto cycle engine in shown in diagram. The opening and closing valves with reference to the position of piston and crank shaft during the four strokes are described as follow. 1.  ...
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Engine Tuning in briefly

  Engine Tuning Engine tuning is more frequently required in modern high compression engine which are more sensitive to variation from specifications than the earlier slow speed low output engines. To maintain an engine at peak performance and economy it must be kept in good condition with all components upto specifications. Often during the engine tuning several conditions will be found which must be corrected to restore the engine to like new condition TUNING PROCEDURE A typical tuning or tune up procedure is given below, which includes visual and mechanical check and also check with instruments. Some of the checks are not related to the engine but should be done for the safety purpose. 1. Loose spark plug start engine to blow out carbon and dirt, shut off engine and remove plug. 2. Test engine compression. 3. If the compression ratio not upto specifications perform engine service that will eliminate the troubles. if the compression is all right re install the spark plug. 4. R...
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FOUR STROKE, DIESEL CYCLE, COMPRESSION IGNITION ENGINE

          FOUR STROKE, DIESEL CYCLE, COMPRESSION IGNITION ENGINE The engine of heavy motor vehicle ( like truck, buses) stationary power plant big industrial units and ships mostly operate on diesel cycle or constant pressure cycle. It was introduced by Dr Rudolph Diesel in 1897. Diesel cycle differs from Otto cycle in one respect. The heat is added at constant pressure instead of at constant volume. Thus, it comprises two adiabatic process, one constant pressure heat addition process and one constant volume heat rejection process. Diesel cycle engines mostly use heavy oils. Diesel oil is the most common. Diesel cycle engine only air is compressed in the cylinder to a high pressure, the temperature of nice compressed air Sufficiently high to ignite fuel. Diesel is injected in the cylinder at the end of compression stroke which itself ignitor new to high temperature of the compressed air. There is no spark plug in diesel engine. In a four stroke diesel cycle, co...
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